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Support Forum.
If your question is not directly related to the File Upload plugin, you might have a better chance to get a reply by posting to Stack Overflow.

The jQuery Iframe Transport is required for browsers without XHR file upload support.
The UI version of the File Upload plugin also requires the JavaScript Templates engine as well as the JavaScript Load Image and JavaScript Canvas to Blob functions (for the image previews and resizing functionality). These dependencies are marked as optional, as the basic File Upload plugin can be used without them and the UI version of the plugin can be extended to override these dependencies with alternative solutions.

The repository also includes the jQuery XDomainRequest Transport plugin, which enables Cross-domain AJAX requests (GET and POST only) in Microsoft Internet Explorer >= 8. However, the XDomainRequest object doesn't support file uploads and the plugin is only used by the Demo for Cross-domain requests to delete uploaded files from the demo file upload service.